JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Yuan Li,Biao Pei,Junjie Chen,Shaosuo Bing,Linxiao Hou,Qi Sun,Gang Xu,Zhikan Yao,Lin Zhang
A novel catalyst with a yolk-shell structure was designed to overcome the leaching of noble metals in heterogeneous catalysis. Through a template method, palladium (Pd) nanoparticles were encapsulated by hollow spherical covalent organic frameworks (COFs) consisting of 2,4,6-trihydroxybenzene-1,3,5-tricarbaldehyde (Tp) and p-phenylenediamine (Pa). The final catalyst with a yolk-shell structure was denoted as (Pd/C)@TpPa COFs. The unique morphology and chemical structure of this novel composite (Pd/C)@TpPa COFs were confirmed by a transmission electron microscope (TEM), a laser particle analyzer, X-ray diffraction (XRD), and N 2 adsorption and desorption. Subsequently, to demonstrate its catalytic performance brought by structural design, this novel catalyst was applied to catalyze the Suzuki reaction . Interestingly, this catalyst exhibited a brilliant size cutoff efficiency for aryl benzene amounting to 100% and achieved a high conversion with only 0.05 mol% Pd loading. Besides, this catalyst could be readily recovered via filtration and reused for at least five consecutive cycles without any significant loss in its activity.
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高影响因子
ACS Applied Energy Materials
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2021
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IF 6.024
Shuo Zhao,Yuepeng Liu,Yanyun Wang,Liying Xie,Jiasheng Fang,Yiwei Zhang,Yuming Zhou,Shuping Zhuo
Carbon nitride is found to be an outstanding metal-free photocatalyst for photocatalytic hydrogen evolution. However, carbon nitride suffers from insufficient light absorption and wide band gap, which limits the photocatalytic efficiency. Herein, we develop a carbon-rich graphitic carbon nitride with cross pore channels. The influence of rich carbon and porous structure on the optical and electrical properties of as-prepared carbon nitride is studied in detail. The carbon-rich carbon nitride exhibits larger surface area, enhanced light-harvesting ability, faster separation rate of photoinduced carriers through abundant carbon rings and narrower band gap than bulk CN. Especially, the carbon-rich carbon nitride displays a much higher hydrogen generation efficiency (551.5 μmol/h), which is approximately 117 times and 2.3 times higher than that of bulk carbon nitride obtained by the calcination of melamine (4.7 μmol/h) and pure CN (240.3 μmol/h), respectively. Moreover, an advanced H2 evolution rate of 3.7 μmol for CN-50 is obtained within 4 h without the addition of Pt cocatalysts, which is two times higher than that of pure CN. More importantly, excellent photostability with a negligible decrease in the catalytic ability for CN-50 can be achieved. This fabrication method can be extended to the design of catalysts with excellent photocatalytic activity for hydrogen generation, CO2 reduction, and many other processes.
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Frontiers in Molecular Biosciences
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2021
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IF 5.246
Zhang Yin,Wang Qinge,Xu Yuping,Sun Jing,Ding Yanbo,Wang Li,Chen Bingfang,Sun Kewen,Chen Jianping
Benign esophageal strictures (BESs) frequently results from esophageal fibrosis. The transformation of fibroblasts into fibrocyte is an important cause of fibrosis. The treatment of fibrosis is challenging. Some previous studies have indicated the antifibrotic effect of mitomycin C (MMC). However, the mechanism of action of MMC and its optimal dose for treatment remains unclear. In the present study, the role of MMC in fighting fibrosis and its mechanism was investigated. Human esophageal fibroblast cells (HEFs)were treated without or with MMC, at 2, 5, 10 μg/ml, combining with mimic lncRNA-ATB, miR-200b inhibitor, rapamycin (RAPA), and 3-Methyladenine (3-MA). The cell viability, and cell apoptosis were evaluated. In addition, expression of apoptosis related proteins (caspase8 and caspase3), autophagy related proteins (LC3II and ATG5) and fibrosis related proteins (α-SMA collagen-1 and TGF-β) were also evaluated. Furthermore, autophagosome was observed by transmission electron microscope. Results showed that the expression of lncRNA-ATB was down-regulated and miR-200b was up-regulated after treated with MMC. And MMC induced cell apoptosis and inhibited cell autophagy. On the other hand, RAPA, mimic lncRNA-ATB and miR-200b inhibitor reduced fibrogenic effect of MMC on HEFs. Collectively, this study suggests that MMC inhibited esophageal fibrosis by regulating cell apoptosis and autophagy via downregulating lncRNA-ATB and upregulating miR-200b.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2021
·
IF 3.927
Yefei Zhang,Yu Chen,Yunrui Hei,Shan Wang,Yingying Shi,Fengzhi Jiang,Lijun Luo
In this work, novel photocatalytic C-doped Bi 2 O 3 nanowires were prepared by a facile method using BN-0.5 adsorbent as a precursor. BN-0.5 adsorbent with nanowire structure was successfully synthesized by a novel solvothermal method by controlling the dosage of 1, 4-benzenedicarboxylic acid (H 2 BDC). BN-0.5 was not only used as template in the preparation to maintain the nanowire structure, but also as a source of C. The C elements could not only enhance the absorption of BPA, but also enhance effective spatial separation of photo-generated e − /h + pairs. As a consequence, the removal ratio of BPA over C-doped Bi 2 O 3 nanowires could reach 98.9%, after only 24 min of illumination. The removal mechanism of BPA on the C-doped Bi 2 O 3 nanowires was discussed. More importantly, this work provides a facile method for the preparation of C-doped Bi 2 O 3 nanowires, which are potential photocatalysts for treatment of water and are also suitable for mass production. These findings will help to design ideal structure, understand catalytic mechanism and spur development of solar driven technologies for environmental remediation.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Yijie Feng,Wenjiao Sang,Zhiyi Deng,Shiyang Zhang,Cuihua Li
Co-N-C@SiO 2 with Co, N doped carbon as core and SiO 2 as shell was successfully synthesized by template method, and SiO 2 shell was about 43 wt%. Impressively, the SiO 2 shell increased the active sites of the core in Co-N-C@SiO 2 preparation, and reduced the loss of active sites during use. Co-N-C@SiO 2 /PMS was a 1 O 2 dominated non-radical reaction, which was less interfered by solution pH and water constituents. In addition, Co-N-C@SiO 2 possessed better cycling performance compared with Co-N-C. Finally, the possible SMX degradation pathways were presented based on the identified intermediate products.
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CARBON
·
2021
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IF 9.594
Zhen Xiang,Xiang Zhang,Yuyang Shi,Lei Cai,Jie Cheng,Haojie Jiang,Xiaojie Zhu,Yanyan Dong,Wei Lu
Developing high-efficiency electromagnetic wave absorption materials with versatility has been a hotspot and it remains a huge challenge. Here, we reported versatile laminated Ni nanoparticles @ porous carbon (Ni@C) nanocomposites synthesized by a facile carbonization of Ni-based metal-organic frameworks (MOFs) precursor. It was found that the phase components (Ni and C phases) and nano/microstructure (laminated and porous characterizations) were well-modified by controlling the calcination temperature, which led to the variation of the degree of graphitization , magnetic properties , and electromagnetic performances. It showed that the laminated porous Ni@C nanocomposites achieved enhanced microwave absorption performances with a thin thickness of 1.5 mm, a strong reflection loss of −59.8 dB and an effective absorption bandwidth of 4.5 GHz. The underlying microwave absorption mechanism was owing to the improved synergistic effects of polarization relaxation, electron transport , ferromagnetic resonance, as well as multiple reflections and scattering in the laminated porous Ni@C nanocomposites. Furthermore, the multicomponent and laminated porous architecture endowed nanocomposites with favorable waterproof, heat isolation and infrared shielding versatility. Therefore, this work demonstrated a facile approach to develop MOFs-derived versatile laminated porous nanocomposites with efficient microwave absorbing performances.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Hong Li,Xinzhu Wen,Feng Shao,Shiwei Xu,Chao Zhou,Yafei Zhang,Hao Wei,Nantao Hu
Rational materials design is critical to develop advanced electrodes for high-performance sodium-ion battery. In this work, a well-designed structure with interlayer-expanded molybdenum disulfide (MoS 2 ) vertically anchored on graphene substrates (v-MoS 2 /rGO) is achieved by one-pot hydrothermal synthesis . The vertical anchored MoS 2 and high conductivity graphene sheets provide a good path for electrons/ion transfer. More importantly, the direct linkage of O from functional group on graphene oxide (GO) with edge S of MoS 2 (C-O-S) is constructed, which can maintain the stability of the v-MoS 2 /rGO electrode and enhance its electrons transport rate for the high-rate performance and long cycle life. The assembled sodium-ion battery shows high rate performance (129.2 mAh g −1 at 10 A g −1 ) and long cycling stability (251.2 mAh g ‐1 −1 at 2 A g −1 after 1000 cycles with an ultra-low degradation of 10.9 μAh g −1 per cycle). The excellent performance makes the designed structure a fascinating anode for sodium battery.
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INORGANIC CHEMISTRY
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2021
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IF 5.165
Yueyao Du,Zhifeng He,Fangwei Ma,Yuchen Jiang,Jiafeng Wan,Guang Wu,Yifu Liu
Recently, Mo-based metal catalysts are widely applied in the electrocatalytic nitrogen reduction reaction (NRR) due to the lower binding energy between the Mo atom and N atom. The design of a Mo-based catalyst@carbon heterostructure and the introduction of anion vacancies are effective measures to improve their NRR performance. In this research, the cross-linked Vo-MoO2@C (Vo means oxygen vacancies) heterostructure nanoparticles with rich oxygen vacancies are first synthesized via pectin assisted hydrothermal reaction followed by calcination and treating with NaBH4 solution. Vo-MoO2@C exhibits good electrocatalytic NRR performance with an ammonia yield rate of 9.75 μg h–1 mg–1 at −0.5 V (RHE) and a Faraday efficiency (FE) of 3.24% at −0.3 V (RHE) under ambient conditions.
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ACS Applied Materials & Interfaces
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2021
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IF 9.229
Chun Zhang,Xiaodong Jin,Liping Wang,Chengzhao Jin,Xiaoqian Han,Weigang Ma,Xingang Li,Guixiang Teng
Enrichment and detection of glycopeptides are an important clinical measure for the diagnosis of complex diseases. Enrichment materials play a key role in this process; they must have an effective sample-screening ability to eliminate the interference of nonglycopeptides. In this work, novel hollow MnFe2O4@C@APBA nanospheres (HMCAs) with magnetic and pH responsiveness were prepared for glycopeptide enrichment. The as-prepared composites have a suitable hollow structure and large specific surface area, and the boron hydroxyl group in their cavities can fix or disconnect the hydrophilic groups of the glycopeptides at different pH, so the glycopeptides can be adsorbed or desorbed in a controllable way. Enrichment results showed that the HMCAs exhibited an excellent enrichment performance: ultralow limit of detection (approximately 0.5 fmol μL–1), perfect size-exclusion effect (HRP/BSA, 1:800, w/w), favorable universality (HRP, IgG, and RNase B), and high binding capacity (150 mg/g). In order to verify the application of materials in practice, the HMCAs were used for the analysis of complex samples and it was found that 474 glycopeptides were identified from 210 glycoproteins in three replicate analyses of 2 μL of human serum. The results showed that the HMCAs could be used as a promising enrichment material for glycopeptide characterization in MS-based glycoproteomics and related fields.
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Science China-Materials
·
2021
·Vol. 65
·期 1
·95-104
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IF 8.273
Bao Kepan,Pang Yuepeng,Yang Junhe,Sun Dalin,Fang Fang,Zheng Shiyou
Rational composite design is highly important for the development of high-performance composite polymer electrolytes (CPEs) for solid-state lithium (Li) metal batteries. In this work, Li closo-borohydride, Li 2 B 12 H 12 , is introduced to poly(vinylidene fluoride)-Li-bis-(trifluoromethanesulfonyl) imide (PVDF-LiTFSI) with a bound N -methyl pyrrolidone plasticizer to form a novel CPE. This CPE shows superb Li + conduction properties, as evidenced by its conductivity of 1.43 × 10 −4 S cm −1 and Li + transference number of 0.34 at 25°C. Density functional theory calculations reveal that Li 2 B 12 H 12 , which features electron-deficient multicenter bonds, can facilitate the dissociation of LiTFSI and enhance the immobilization of TFSI to improve the Li + conduction properties of the CPE. Moreover, the fabricated CPE exhibits excellent electrochemical, thermal, and mechanical stability. The addition of Li 2 B 12 H 12 can help form a protective layer at the anode/electrolyte interface, thereby preventing unwanted reactions. The above benefits of the fabricated CPE contribute to the high compatibility of the electrode. Symmetric Li cells can be stably cycled at 0.2 mA cm −2 for over 1200 h, and Li∥LiFePO 4 cells can deliver a reversible specific capacity of 140 mA h g −1 after 200 cycles at 1 C at 25°C with a capacity retention of 98%.
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Journal of Advanced Ceramics
·
2021
·Vol. 10
·期 5
·1129-1139
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IF 6.707
Wu Pengfei,Shi Benyang,Tu Huibin,Guo Changqing,Liu Anhua,Yan Guan,Yu Zhaoju
Severe volume expansion and inherently poor lithium ion transmission are two major problems of silicon anodes. To address these issues, we proposed a pomegranate-type Si/C composite anode with highly dispersed tiny silicon particles as the core assisted by small amount of SiC. Skillfully exploiting the high heat from magnesiothermic reduction, SiC can assist the good dispersion of silicon and provide good interface compatibility and chemical stability. The silicon anchored to the carbon shell provides multipoint contact mode, that together with the carbon shell frame, significantly promoting the transfer of dual charge. Besides, the pomegranate-type microcluster structure also improves the tap density of the electrode, reduces the direct contact area between active material and electrolyte, and enhances the electrochemical performance.
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ELECTROCHIMICA ACTA
·
2021
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IF 6.901
Xiaoqin Liu,Yu Xiang,Qingping Li,Qiaoji Zheng,Na Jiang,Yu Huo,Dunmin Lin
Bimetallic sulfides are considered as one of the most promising anode materials for sodium ion batteries (SIBs) due to their high conductivity and electrochemical activity. However, they still suffer from challenges such as large volume changes, low initial coulombic efficiency and poor cycling performance. Herein, we synthesize SnS 2 -CoS 2 @C (SCS@C) core-shell nanocubes with abundant mesopores through simple carbon coating and sulfidation strategies using polymeric resorcinol-formaldehyde as carbon source. The porous nanostructure of SCS@C is conducive to shortening the transport path of sodium ions and facilitating the infiltration of electrolyte, while the carbon shell can buffer volume expansion stress during charging and discharging processes. As a result, the SCS@C electrode exhibits an excellent sodium storage: an outstanding initial coulomb efficiency of 92.8%, remarkable cycling performance of 662 mAh g −1 at 100 mA g −1 after 70 cycles with extremely low capacity decay of 0.00013% per cycle, and long cycle durability of 402.5 mAh g −1 at 5 A g −1 over 500 cycles. Our study provides a viable strategy for the rational design of bimetallic sulfides anode materials with high efficiency and long term stability for sodium storage.
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